Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ee8772d9594fbc6…

MALICIOUS

PDF

74.7 KB Created: 2021-09-28 18:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: aa405acb3cad2b674fb3bb7402cc1c3f SHA-1: 1b2eff5e287dc81e439d0562a2b3529cc96e9b41 SHA-256: 5ee8772d9594fbc6936208d57f54b321dcaf1a0eda0ef761214f695a26b0f199
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm structure. The PDF contains numerous external URIs, many pointing to potentially compromised or disposable domains, suggesting a phishing or redirection scheme. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://redac.ch/upload/gopapikumudebisuses.pdf In PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/nijikizugorogomizutiziguk.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/6555890697.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/30133100808.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/13751849013.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/sgb55mgj04o0l2u3c524aemt17/16265744888.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/rilaw.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/60608002673.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/99621709432.pdfIn PDF document text
    • http://centre.annuaire-regional.com/ckfinder/userfiles/files/nifugetunudixejavoxukater.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/40803800253.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/xufozegetujapuro.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/64373919074.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/65840654028.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/kelesudibamigumokovipe.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/tamopatavakufukolebuvuli.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/80698062566.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/fogovo.pdfIn PDF document text
    • http://strandedtattoo.com/file/29634027862.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/lujazivenopidugutifes.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/13249399061.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/wogisijatutedapivomodezex.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/11438574085.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/60542800216.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/6107203568.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/futatofomus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=comparative+superlative+test+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC48 19004 bytes
SHA-256: 87bd1614cbe6755b7782381b7056571311e75685eb3a8a2e5f70d50747965a62
font_01_sfnt_off0000ebc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DA 10752 bytes
SHA-256: d256369ff9fb892253acf584b5131eb5e98ef27926d7e6b964c737c3946a7c79